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Gate defined wires in HgTe quantum wells: from Majorana fermions to spintronics

Reuther, Johannes and Alicea, Jason and Yacoby, Amir (2013) Gate defined wires in HgTe quantum wells: from Majorana fermions to spintronics. Physical Review X, 3 (3). Art. No. 031011. ISSN 2160-3308. doi:10.1103/PhysRevX.3.031011.

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We introduce a promising new platform for Majorana zero-modes and various spintronics applications based on gate-defined wires in HgTe quantum wells. Due to the Dirac-like band structure for HgTe the physics of such systems differs markedly from that of conventional quantum wires. Most strikingly, we show that the subband parameters for gate-defined HgTe wires exhibit exquisite tunability: modest gate voltage variation allows one to modulate the Rashba spin-orbit energies from zero up to ~30K, and the effective g-factors from zero up to giant values exceeding 600. The large achievable spin-orbit coupling and g-factors together allow one to access Majorana modes in this setting at exceptionally low magnetic fields while maintaining robustness against disorder. As an additional benefit, gate-defined wires (in HgTe or other settings) should greatly facilitate the fabrication of networks for refined transport experiments used to detect Majoranas, as well as the realization of non-Abelian statistics and quantum information devices.

Item Type:Article
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URLURL TypeDescription Paper
Alicea, Jason0000-0001-9979-3423
Additional Information:© 2013 American Physical Society. Received 14 March 2013; published 26 August 2013. The authors gratefully acknowledge illuminating conversations with Jim Eisenstein, David Goldhaber-Gordon, Taylor Hughes, and Torsten Karzig. This research was supported by the Deutsche Akademie der Naturforscher Leopoldina through grant LPDS 2011-14 (J.R.); the Alfred P. Sloan Foundation (J.A.); the National Science Foundation through grant DMR-1055522 (J.A.) and grant DMR-1206016 (A.Y.); and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation. This work is also supported in part by a grant from the Microsoft Corporation (A.Y.).
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Deutsche Akademie der Naturforscher LeopoldinaLPDS 2011-14
Alfred P. Sloan FoundationUNSPECIFIED
Institute for Quantum Information and MatterUNSPECIFIED
NSF Physics Frontiers CenterUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Microsoft CorporationUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20130408-095618952
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Official Citation:Gate-Defined Wires in HgTe Quantum Wells: From Majorana Fermions to Spintronics Johannes Reuther, Jason Alicea, and Amir Yacoby Phys. Rev. X 3, 031011 – Published 26 August 2013
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37801
Deposited By: Ruth Sustaita
Deposited On:08 Apr 2013 17:23
Last Modified:09 Nov 2021 23:31

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